Organic EL Panel Ink Jet Coating Insolubilization
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Solution Overview
Problem
The manufacturing of organic electroluminescent panels faces challenges in achieving uniform film thickness due to the dissolution of previously applied layers during multiple recoating processes, leading to streaky luminance unevenness, especially when using ink jet devices with decreased pixel size and reduced liquid retention per unit area.
Innovation Solution
A method involving the application of a first organic material layer followed by an insolubilization process to change the molecular structure, which is then overlaid with a second organic material layer, both sharing common principal components, to prevent dissolution and ensure uniformity, particularly in the formation of hole transport, organic light emitting, and electron transport layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recoating is performed by a plural number of times to increase ink density, then the organic material layer can be formed with sufficient thickness, but the previously applied layer dissolves into the recoated ink causing film thickness unevenness and streaky luminance
Solution Approach 1:
The patent applies an insolubilization process (such as UV irradiation or heat treatment) to the first organic material layer before applying the second layer. This preliminary action converts the soluble first layer into an insoluble state, preventing it from dissolving when the second layer is recoated, thereby maintaining film thickness uniformity while achieving sufficient ink density
Solution Approach 2:
The patent changes the solubility parameter of the first organic material layer by performing an insolubilization process. This parameter change transforms the layer from a soluble state (prone to dissolution during recoating) to an insoluble state (resistant to dissolution), resolving the contradiction between achieving high ink density through multiple coatings and maintaining film thickness uniformity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively suppresses streaky luminance unevenness by making the first organic material layer less susceptible to dissolution by the second layer, maintaining uniform film thickness and enhancing manufacturing efficiency with common ink usage, reducing the need for frequent ink tank exchanges and lowering production costs.
Implementation Method 1
an insolubilization process is performed for the first organic material layer to provide a change to a structure of molecules included in the first organic material layer
Data Source
AI summary
There is provided a manufacturing method for an organic electroluminescent panel that includes an organic electroluminescent element for each sub-pixel. The manufacturing method includes an application step of recoating a first organic material layer and a second organic material layer, which include principal components common to each other, to manufacture the organic electroluminescent element. At the application step, after the first organic material layer is applied, an insolubilization process is performed for the first organic material layer to provide a change to a structure of molecules included in the first organic material layer, and the second organic material layer is applied to the first organic material layer after the insolubilization process is performed.